Manufacture of cream of tartar.



riNrrEn srn'r-Es PATENT oEEroE.

JoHN B. MOSZOZENSKI, 01* NEW YORK, N. Y., Assre oE TO TABTAB CHEMICALCOMPANY, or JERSEY CITY, NEW JEasEY, a CORPORATION or NEW JEns Y.

MANUFACTURE OF CREAM 0F TARTAR.

No Drawing.

To all whom it may concern:

Be it known that I, JoHN B. MoszozEN- SKI, a citizen of the UnitedStates, residing in the borough of Brooklyn, city and State of New York,have invented new and useful Improvements in the Manufacture of Cream ofTartar, of Which the following is a specification.

The invention relates to a new process for the manufacture of cream oftartar and has for its object the commercial production of cream oftartar from argols, lees, and similar material, with greater efficiencyand economy.

The process comprises the use of solutions of chemicals of suchcharacter as to assist in extracting the potassium bitartrate from thematerial containing it and, upon change of temperature, permit thebitartrate to cystallize out; and it is preferably practised so thatafter the cystallization both the potassium bitartrate and themother-liquor are left substantially unchanged, the latter being fit foruse over and over again in the same manner.

By this process the amount of potassium bitartrate extracted in oneoperation with a certain volume of liquor is considerably larger (beingin fact several times as large) than when the usual process of usingwater' alone for dissolving is followed and at the same time thechemicals used involve little expense, being available for repeated use,only small quantities being lost mechanically in the process ofmanufacture.

The chemicals used should be adapted to the purpose. Solutions of thealkali-salts of those acids which precipitate bitartrate of potassiumfrom neutral potassium tartrate solutions and which do not dissolvepotassium bitartrate are desirable. Many acids precipitate thebitartrate from neutral tartrate solutions and also dissolve thebitartrate. A salt of an acid which precipitates but does not dissolveshould be employed. And I prefer to use solutions of potassium, ammoniumor sodium acetate, which I have discovered dissolve considerablequantities of potassium bitartrate in heat, these quantities beinggreater than water alone will take up, and on cooling permit most of thebitartrate so dissolved to crystallize out in an unchanged condition,leaving the mother-liquor almost unchanged Specification ofLetters-Patent.

Patented Dec. 15, 1914.

Application filed January 28, 1911. Serial No. 605,147.

this tendency, as, for example, a small quantity of a potassium salt.

Specifically to illustrate the practice of the process: A solution maybe made of water andlsodium acetate. This solution is preferably about20% acetate, but it may vary within wide limits. The temperature ofthesolution is raised to the boiling point and the argols or othermaterials introduced therein. The potassium bitartrate which goes intosolution may then be separated from the undissolved residue by anyconvenient method, as, for example, the usual method of presslng. As thesolution cools,

,Qpreferably while being stirred, the potassium bitartrate willcrystallize and separate, the acetate (being much more soluble)remaining in solution. The mother-liquor containing the acetate insolution may then be again used by being raised in temperature, freshargols or other materials being introduced therein, and the process thusrepeated or made continuous.

It will be understood that the solution upon the potassium bitartratebeing dissolved therein Will contain in addition to the potassiumbitartrate some impurities taken up from the raw material and somecalcium tartrate. Various methods are known for converting and makinguse of the calcium tartrate and any suitable method may be convenientlyused in treating the mother liquor of the crystallization in connectionwith the process when desired.

There are many advantages connected with the process in addition to itsdirect advantages in eficiency and economy. For example, according tothe method now largely used, the bitartrate of potassium uponcrystallization from its solution in hot water is again dissolved forpurposes of improving its color by bleaching or otherwise. The processof my invention is such that a decolorizing agent (as, for eX- ample,bone-black) may be introduced to the solution containing the potassiumbitartrate when it is separated from the undissolved residue. and thusthe redissolution now commonly practised may be avoided.

So far as I know, my process in its essence is broadly new.

I claim 1. A process for manufacturing cream of tartar comprisingsubjecting material containing potassium bitartrate to the action of asolution of sodium acetate, at high temperature, to dissolve thepotassium bitartrate, and then cooling the solution containing thedissolved potassium bitartrate to permit the crystallization thereof.

2. A process for manufacturing cream of tartar comprising subjectingmaterial containing potassium bitartrate to the action of a solution ofan acetate, at high temperature, to dissolve the potassium bitartrate,and then cooling the solution containing the dissolved potassiumbitartrate to permit the crystallization thereof.

3. A process for manufacturing cream of tartar comprising subjectingmaterial containing potassium bitartrate to the action of a solution ofa salt of an acid which precipitates bitartrate of potassium fromneutral potassium tartrate solution and does not dissolve potassiumbitartrate, at high temperature, to dissolve potassium bitartrate insuch solution, and then cooling the solution containing the dissolvedpotassium bitartrate to permit the crystallization thereof.

4. A process for manufacturing cream of tartar comprising subjectingmaterial containing potassium bitartrate to the action of watercontaining a substantial amount of salt which increases the solventaction thereof for the said bitartrate, at high temperature to dissolvethe potassium bitartrate, and then cooling the solution containing thedissolved potassium bitartrate to permit the crystallization thereof.

5. A process for manufacturing cream of tartar comprising making a watersolution of an alkali metal salt which increases the solvent power ofsuch water for potassium bitartrate, introducing materials containingpotassium bitartrate thereto at high temperature to dissolve thepotassium bitartrate therein, separating the potassium bitartrate insolution from the undissolved ing cream oftartar comprisingsubjectingmaterial containing potassium bitartrate to the action of a solutioncontaining a substantial quantity of another salt having a solventaction upon bitartrate at high temperature, cooling the solutioncontaining potassium bitartrate and obtaining the potassium bitartrateby crystallization, raising the temperature of the mother-liquor andsubjecting fresh supplies of such raw material to the action thereof.

7 A continuous process for manufactur ing cream of tartar comprisingsubjecting material containing potassium bitartrate to the action of asolution of sodium acetate, at high temperature, cooling the solutioncontaining potassium bitartrate and obtaining the potassium bitartrateby crystallization, raising the temperature of the motherliquor andsubjecting fresh supplies of such raw material to the action thereof.

8. A continuous process for manufacturing. cream of tartar comprisingsubjecting material containing potassium bitartrate to the action of asolution containing a salt of an acid which precipitates bitartrate ofpotassium from neutral potassium tartrate solution and does not dissolvepotassium bitartrate, at high temperature, cooling the solutioncontaining potassium bitartrate and obtaining the potassium bitartrateby crystallization, raising the temperature of the mother-liquorandsubjecting fresh supplies of such raw material to the action thereof.

9. In the manufacture of cream of tartar, the process which comprisessubjecting materials containing potassium bitartrate to a solution ofasalt more soluble than potassium bitartrate which will dissolve greaterquantities of potassium bitartrate than water when heated while allowingit to crystallize when cooled.

10. In the manufacture of cream of tartar, the process which comprisessubjecting materials containing potassiunr bitartrate to the action of asolution of a salt of an alkali more soluble than potassium bitartratein the same solution which will dissolve the potassium bitartrate whenheated and allow it to crystallize when cooled.

JOHN B. MOSZCZENSKI. l/Vitnessesz ConALm CHOATE, HERMAN Gns'row.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

